"Hover Style" for JTextPane

I am programming on a reporting system which shows text,
pictures and information (very much like an HTML page).
For this I use the JTextPane, the DefaultStyleDocument
and the StyleConstants, and this works very well. Now,
I would like to add another style: one which shows a
small tool-tip or pop-up whenever the mouse hovers for
a defined amount of time (say 100 ms.) I would like to
specify the text (or even a whole component) and the
delay.

I just am writing a similar application. I am afraid I didn't find a simple solution.

Summary:

Use the MouseMotionListener and translate the Point to the Position using AccessibleText.getIndexAtPoint(). Using StyledDocument.getCharacterElement(offset).getAttributes() detect the hover style and then show the pop-up. I still am working on how to do the pop-up, so I am sorry I can't give you hints on how to do the delay. I would use a Timer and recheck the current position of the mouse later.

Detailed steps:

#1 -- I created a custom JComponent which has a JTextPane inside (if you prefer just extend JTextPane, this doesn't matter).

#2 -- I wrote a MouseMotionListener which catches the mouse movements. I then translated the coordinates to the offset into the text. This was difficult, but then I discovered in the AccessibleText the function getIndexAtPoint() which does exactly what I needed. See code:

#3 -- I designed a HoverListener interface and wrote addHoverListener and removeHoverListener methods to access them. A HoverListener is a low-level event very similar to the MouseMotionListener, but gives a Position object which is the position of the mouse into the text. See code: